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STLD20D Datasheet(PDF) 12 Page - STMicroelectronics

Part # STLD20D
Description  White LED power supply
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STLD20D Datasheet(HTML) 12 Page - STMicroelectronics

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Typical performance characteristics
STLD20D
12/31
Figure 10.
Load disconnect switch resistance Figure 11.
Quiescent Current consumption
Figure 12.
Max peak inductor current IL versus
L and RSET
Figure 13.
Max peak inductor current IL versus
RSET
Figure 14.
ILED versus duty cycle
Figure 15.
Typical waveform
2.0
3.0
4.0
5.0
6.0
7.0
2.5
3.0
3.5
4.0
4.5
T = 85°C
a
T = 25°C
a
T = -40°C
a
V (V)
IN
RDSon( )
Ω
200.0
250.0
300.0
350.0
400.0
450.0
500.0
2.5
3.0
3.5
4.0
4.5
T = 85°C
a
T = 25°C
a
T = -40°C
a
V(V)
IN
I (µA)
Q
200.0
250.0
300.0
350.0
400.0
450.0
500.0
550.0
600.0
4.0
8.0
12.0
16.0
20.0
24.0
RSET = GND
RSET = 100K
L(µH)
I
(mA)
LIM
300
200
250
350
400
450
500
550
600
30
40
50
60
70
80
90
100
R(k )
SET
Ω
I
(mA)
LIM
I
= f(R
)
(L = 10µH)
LIM
SET
I
= 450 mA
R
LIM
SET = 56 k
Ω
0
2
4
6
8
10
12
14
16
18
20
0
1020
3040
5060
7080
90
100
Theoretical
Real Values 300Hz
Real Values 10kHz
Duty(%)
I
(mA)
LED
I
= F(Duty), T = 25°C
LED
a
VOUT
VSW
ILED
IL



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